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Stephen Krosoczka - President

At Sem-Tec, we pride ourselves in providing custom made valve balls manufactured in the USA along with world-class support.


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Deborah Dowdy - Sales Coordinator & Office Manager

Deb's detail-oriented personal approach guarantees our customers receive the products they require in a timely fashion.


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Jeff MaNcini - Plant General Manager

Jeff's dedication to efficiency and loyalty to our company is paramount in ensuring effective production.  His creative-minded approach ensures our customers needs are met.  Jeff's 40 years of experience at Sem-Tec makes him our greatest asset!